West Nile, Fort Collins and Weld counties
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A Fort Collins resident is confirmed to be Larimer County’s first case of West Nile virus this year and the third human case reported in Colorado.
Colorado public health officials shared Tuesday that the first human cases of West Nile virus of 2025 had been confirmed in two Adams County residents.
Two people in Adams County have tested positive for West Nile Virus, which has seen a significant increase in mosquitoes in the state. Dr. Lindsey Fish, Internal Medicine with Urgent Care at Denver Health,